Mist coolant dispenser



July 21, 1959 J. HARR 2,895,684

7 MIST COQLANT DISPENSER Filed May 29, 1958 s Sheets-Sheet 1 July 21,1959 J. HARR MIST coo'LANT DISPENSER,

Filed May 29. 1958 3 Sheets-Sheet 2 J. HARR MIST COOLANT DISPENSER 3Sheets-Sheet 3' Filed Mai 29. 1958 States This invention deals with adispenser for mist coolants used in drilling and other cuttingoperations on metals and similar materials. More specifically, itrelates to a mist-withdrawal system employed in such dispenser.

When metals are drilled or subjected to similar operations involving thecutting of metal, the portion from which the metal is cut is generallysubjected to a slow flow of light lubricating oil which also acts as acoolant. More recent installations employ a mist of oil in an air streamwhich not only reduces the amount of oil used on the working part, butalso supplies a blast of air therewith to further facilitate the coolingaction.

The present invention involves a dispenser for such a mist coolant andparticularly, to a mist withdrawal system of extreme simplicity and easeof operation and requiring a minimum of maintenance.

The invention will be more readily understood by reference to theaccompanying drawings in which Figure 1 presents a perspective view of apreferred embodiment of a dispenser of the present invention inassembled form ready for use. Figure 2 presents a cross-sectional sideview of the valve block and oil inlet system, while Figure 3 shows across-sectional front view of the valve block. Figure 4 illustrates aside view of the valve end of the mist coolant discharge line. Figure 5shows a side view partially in cross-section of the valve end of themist coolant discharge line depicted in Figure 4, while Figure 6illustrates a side view partially in cross-section, of the discharge endof the mist coolant discharge line. Figure 7 presents an end view of thevalve end of the mist coolant discharge line shown in Figure 5. Figure 8is a cross-sectional view along VIII-VIII of Figure 5, while Figure 9 isa cross-sectional view along IX--IX of Figure 6. Similar numerals referto similar parts in the various views.

Referring again to the drawings, numeral 1 represents a containerwherein coolant oil is poured thereinto through screen 2 located in thetop of the container, which container may be mounted at holes 3 at ornear the metal working machine to be used in conjunction therewith.Mounted within front wall 4 of this container by means of screws 5 isvalve block 6 having two valves 7 and 8, serving as the discharge andair inlet valves, respectively. The mist coolant discharge line 9 hasits valve end 38 (Figs. 4 and 5) connected at opening 10 of the block,and its discharge noozzle end 11 is hung on a rack 12 (Fig. 1) which maybe fastened on to the container or at any other convenient location.Opening 13 in valve block 6 serves as the connection means with an airpressure line (now shown) which would supply the compressed air requiredfor the discharge of the mist coolant.

As is apparent from Figures 2 and 3, valve block 6 is provided withthreaded hole 15 disposed in lower face 16 of the block. Hole 15 isconnected with threaded hole 17 in upper face 18 of the block by opening19 which may be shut off completely or throttled by valve pin 20 ofvalve 7, since pin 20 is adapted to fit into block atent seat 21.Threadedv portion 22 of valve 7' rides in. threaded hole 17 and O-ring23 serves to seal oil the threaded. joint to prevent leakage. Into lowerthreaded hole 15 is fitted oil inlet tube 24having a flared end 25 whichseats against seat 26 in hole 15. Hollow screw 27 serves to keep end 25of tube 24 seated at 26. Tube 24, which is preferably of nylon or othersuitable plastic, is immersed in the oil in container 1 (Fig. 1), andend 28 may be provided with additional slit openings 28' to preventclogging of the inlet end of tube 24.-

Discharge connection 10 of block 6 has drilled into its thread side,hole 35 which continues (as 33 in Fig.3) through block 6 and connectswith the bottomv of threaded hole 34 in upper face 18 of the block.Threaded valve stem 31 of valve 8 is adapted to ride in this latter hole34 and its seatable pin 30 is disposed to shut off or throttle the airentering hole 14 connecting with threaded air inlet opening 13. As isseen in Figure 3, hole 33 is made by drilling hole 33 through side face36 of the block and hole 33' then is plugged by means of plug 33". It istherefore apparent that air may enter connection 13 and its flow intodischarge connection 10 may be regulated by valve 8. Likewise, oilsucked in. through line 24 may have its flow into discharge opening 10regulated by valve 7.

It will be noted from Figure 2 that discharge opening or connection 10is connected with the bottom of valve opening 17 by-hole or channel 63in a manner so that valve pin 20 of valve 7 may be screwed against seat21 to enable the control of oil flowing out of channel or hole Mistcoolant discharge line 37 (Fig. 4) has discharge connection end38'fitting into connection 10 of the block. End 37 of "discharge line 9comprises a small diameter inner tube 39 (Fig. 5), preferably made ofnylon or other suitable material, disposed within heavy air pres-.

sure line or hose 40, which is generally of rubber. At the dischargeconnection or valve end 38 of discharge line 9 the end 41 of nylontubing 39 (Figs. 5 and 7) has disposed within it, for about an inch orso, a length of smaller diameter rigid tubing 42 (of stainless steel orother suitable material) serving to insure against the collapsing oftubing end 41 by gasket pressure. Metal tube 43 is disposed to fit overtubing 39 and to provide an inner seat 44 against which gaskets 45 maybe pressed when they are squeezed against seat 46 of connection 10.Space 47 between tubes 39 and 40 serves as the annular conduit forpassage of air, and, when end 45 is seated in connection 10, air frominlet 13 may pass through channel 14, past valve seat 30 (when valve 8is open), then through channel 33 and through opening 35 in the side ofconnection 10, which opening is outward of seat 45, so that the air mayflow around tube 43 of end 38 and into hole 48 which leads into annularconduit space 47. Threaded nut 49 has screw collar 50 resting onshoulder 51 on metal tube 43 and thus enables screwing in of nut 49 intothreaded hole 10 to effect the gasketed seat made by gasket 65 seatingagainst face block 70 of the block, at which time gasket 45 is made toseat against inner surface 46 of connection 10.

The nozzle end 52 of discharge line end 37 is illustrated in Figures 6and 9. It will be noted that the end 39 of nylon tubing 39 fits into aninner nozzle having a body 53 which has a non-circular periphery, suchas a square periphery 53' (Fig. 9), but also having a circularclosefitting inner periphery 53" into which tube end 39 is cemented sothat air will not flow between 39' and 53" to any substantial degree.Outer periphery 53' of inner nozzle 53 may be triangular, grooved, orotherwise shaped to permit air to flow unimpededly through free spaceportions 54 and out through annular space 55 between inner nozzle tip 60and outer noule 11 and through opening 57 of outer-nozzle.1 1. Heavypressure tubing or hose 4.0 .is fitted.tightly.over corrugated end 5 8Qf nozzle 11. When suction is caused by air flowing out through space 55and out opening 57 of nozzle 11, oil isisucked in through inner.space:59 (Fig. 6) :of tubing 39 and out through tip 150.01? inner nozzle53, whereupo n it mixes withthe-air stream and emerges through opening"57 of nozzle '11 ,in the-form of a fine spray, provided, of course,that valves 7 and .8 are open. "I'he amountof spray and the amount ofoil in the,sp1- ay;depend upon the adjustments of valves 7 and 8.

When in operation, the end of ;a compressed air line is connected toblockopening 13 and discharge hose holding means 38 is screwed intoblock;opening so that gasket 65 (Figs. sand '4),makes,atight seatagainstfront face 70 of block '6, and-air valve 8 is adjusted to permitthedesired amount of air to flow up channel 14, past valve seat 30, throughchannel 33, then through side hole 35 in outlet opening 10 -and1hole 48in discharge hose holding means :38, and through annular space 47,through spaces 54 and 55 and out nozzle opening 57. Then coolant .valve7 is adjusted for the desired amount of oil to be discharged in the formof a mist. This oil enters tube 24, flows through channel 19 then pastvalve pin 20, through channel 63, leading to outlet surface 46 againstwhich gasket 45 is seated and into inner-space 59 of tubing 39 (via end41), since gaskets .45 would .prevent the oil from entering annularspace 47. This oil then passes through tip 60 of inner nozzle 53 whereit meets the'air at 55 and issues in the form of a spray through outlet57 of outer nozzle 11. Valves-7 and 8 are then adjusted for the typeofspray desired.

Iclaim:

1. In a mist coolant dispenser having a container for holding coolant tobe misted, a valve block'having an oil control valve to which oil is fedand having an outlet through which the coolant is centrally dischargedand an air inlet leading to an air control valve and having a channelconnecting the discharge side of said air valve with said outlet, and adischarge hose connectable in .seal n rel i nt seidput et sa dh h in a sl diameter flexible tube disposed annularly therein, both hose and tubeterminating in a nozzle mist discharge end, the improvement comprising avalve block outlet having an annularly disposed seating surface andmeans forming a side opening as a terminus for said channel, a dischargehose mounting circumscribing the other terminus of said tube andcomprising a cylindrical hose holding means disposed around said othertube terminus and having one end adapted to hold one end of said hose,gasketing means disposed around said other tube terminus ahead of andseating against the other end of said hose holding means and constructedto seat in air sealing relation on saidblock outlet seating surfaceinward of said channel opening when the discharge hose is connected tothe block, means forming an air opening in said hose holding meansdisposed outwardly of said g-aske'ting means and pneumaticallyconneetable with said channel opening providing air access from said aircontrol valve to theannular space between said hose and tube, connectingmeans disposed over said hose holding means for connecting said hoseholding means in air sealing relation to said block outlet, said nozzlemist discharge end of said tube having a non-circular periphery adaptedto permit free air flow between said tube and said hose.

2. A mist coolant dispenser according to claim 1 in which the other saidtube terminus has inserted in it a tight fitting short length of rigidtubing.

References Cited in the file of this patent UNITED STATES PATENTS394,657 Melotte Dec. 18, 1888 590,128 Browning Sept. 14, 1897 1,160,703Fleming Nov. 16, 1915 2,483,591 Nichols Oct. 4, 1949 2,667,236 GravesJan. 26, 1954 2,850,323 Veres Sept. 2, 1958

